package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面：实现公共字段自动填充功能
 *
 */
@Aspect
@Component
@Slf4j
//方便记录日志
public class AutoFillAspect {
//    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && " +
        "!execution(* com.sky.mapper.UserMapper.*(..)) && " +  // 排除UserMapper
        "@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){

    }
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("自动填充公共字段开始......");
        // 获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature(); // 获取到方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); // 获取到方法上的注解对象
        OperationType operationType = autoFill.value(); // 获取到数据库中的操作类型

        // 获取当前被拦截的方法的参数 -- 实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }
        Object entity = args[0];

        // 准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();


        // 根据当前不同的操作类型, 为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT){
            try {
                Method setCreatedTime = entity.getClass().getMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreatedUser = entity.getClass().getMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdatedTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdatedUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setCreatedTime.invoke(entity,now);
                setCreatedUser.invoke(entity,currentId);
                setUpdatedTime.invoke(entity,now);
                setUpdatedUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else if(operationType == OperationType.UPDATE){
            try {
                Method setUpdatedTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdatedUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdatedTime.invoke(entity,now);
                setUpdatedUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }
}
